Trubbish

Black +2: Inhaling the gas they belch will make you sleep for a week. They prefer unsanitary places.

White +2: The combination of garbage bags and industrial waste caused the chemical reaction that created this Pokémon.

Black 2 / White 2: Wanting more garbage, they follow people who litter. They always belch poison gas.

Sun: Unsanitary places are what they like best. They can be spotted in Alola, often with Grimer in hot pursuit.

Moon: It gorges on trash until its stomach is full. Then it belches toxic gas. An unlucky whiff of gas will put a person in the hospital.

Ultra Sun: Poisonous gas leaks out of it when it breathes. Muk that catch a whiff of that stench will come drooling.

Ultra Moon: If a young Pokémon or child breathes in the toxic gas that Trubbish belches out, it could be a life-threatening situation.

Sword: Its favorite places are unsanitary ones. If you leave trash lying around, you could even find one of these Pokémon living in your room.

Shield: This Pokémon was born from a bag stuffed with trash. Galarian Weezing relish the fumes belched by Trubbish.